Winter cultivation techniques of lettuce
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Seedlings: Choose fertile sandy loam soil and make it flat after being thinned. Then every 10 square meters of high-quality manure applied sieved 100 kilograms, potassium dihydrogen phosphate 0.5 kilograms, fully mixed, after the leveling surface watering, water infiltration after seeding. Dry seeds are generally used for sowing, but they can also be sowed after germination. Dry seeds are sown with 75% chlorothalonil wettable powder at a seed weight of 0.3%, but should not be allowed to stand for too long. Immersion seed germination, first soaked in warm water 20 °C for 6-7 hours, remove and wrap it in a cloth bag, place germination at 20 °C, washed once a day with water, buds after 2-3 days. Select sowing on a sunny day without wind, sowing 3-5 grams seeds per square meter of seedbed. After sowing, a layer of 3-5 mm thick fine soil was applied.
Soil preparation and fertilization: 5000 kg of compost organic fertilizer and 30-40 kg of compound fertilizer before planting. After the deep plowing, it is made into a flat bark, and the plastic film can be covered with a small puppet. Colonization: Sunlight greenhouse cultivation generally spaced 40 cm, spacing 30 cm, watering before cutting up and cutting, adding more soil. Open ditch or dig planting, seal ditch flat water after planting water.
Management after planting: During the day after planting, the temperature was kept at 20-24°C and the nighttime temperature was above 10°C. During the period of easing, cultivating loose soil 1-2 times. Appropriate cooling after easing the seedlings, suitable for 15-20°C during the day, and easing the seedling water after 7-10 days of easing seedlings, while lightly applying chemical fertilizer, applying about 10 kilograms per acre. Afterwards, cultivating again and seedlings appropriately. After about 15 days, when the rosette leaves have grown up and the heart leaves start to wrap, 15-20 kg of compound fertilizer or ammonium nitrate is applied, and then the ball stage is followed by the top dressing again. The number of times of watering in winter should not be too much to prevent the ground temperature or humidity from being too high. When entering the ball stage, the water supply should be uniform. Do not dry or damp, so as to avoid cracking the ball or opening the ball. Stop watering 3-5 days before harvesting.